VU/UIMUE 


sC 34 454 


on ing 
15-18,1913 on Alameda 


at Sunol 


chief enrincer 


SPRING VALLEY WATER COMPANY jee ’é 


375 SUTTER STREET 


INGINEERING DEPARTMENT 


F. C. HERRMANN 
CHIEF ENGINEER 


SAN FRANCISCO, CAL. Pebruary 4, 1913. 


S. P. Eastman, Esce, 
Vice President and Manager, 
Spring Valley Water Company. 
Dear Sir:- 
For the last 23 years the flow of Alameda Creek has 


been measured at Niles and Sumol dams, the latter being used since 
1900. The method of mossurement was to carefully record the height 
of water over the crests of the dams, and compute the flow by means 
of the standard Francis weir formula, making no allowance for the in- 
crease due to velocity of approach, nor for the decrease due to eub- 
mergence at very high heads. 

Iast year new discharge curves for the flow over these 
dams were made from very careful and scientific experiments by Prof. 
J. H. LeConte on models of these weirs. Prof. LeConte’s results were 
used in computing the discharge of the Alameda Creek in my "Report on 
the Safe Dependable Yield and Availability of the Resources of the 
Spring Valley Water Company," which wae incorporated in the Spring 
Valley Water Company's Report on "The Fature Water Supply of San 
Francisco from the Conservation and Use of its Present Resources" , 
to the Honorable Secretary of the Interior and the Advisory Board 
of Engineers of the United states Army. 

In order to check the determinations of Prof. LeConte, 


Preparations were made this year to measure the flow of Alameda Greek 


. 
el 


at Sunol dan by current meter gagings. Alameda Creek approaches the 
RS, Be 


Sunol dam a vory straight snl wniforn ahamel for s distance of over 


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oe, BES, of thes, Se. 


penoion 008 eae” rie heemnennempnres 


: Rites OT the ateiteet meter Jotetrtins by we, Se 
tin.) | Tere ES 
_ Gresk corresponding to depths over the arest of the dam of 1.00 feot, 


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ALAMEDA CHEER DiutraRS -“ SE, Redd 


se wcmamidea, else ih iz iia a ai 


re “iehed thangs piaffaroteytel Pageant 


orem nena 
Wt done tieyicnt, 7H Rand a — i 
eat he ln =... 
Doing T= 26256 R 4 .065- 4 : aeil ee 


pty ne 
seabn een ebeanntianmmuenaindlie eR eo a aR 
than Tees Geankend tran the Levoste eurre, — 


he maa et some M3 


of Gh Siete and BOO fewk, ney thy Chemecge aapwe ower the sae Gra 


withis: Wee ore aera aig ia Velocity — 


Of Approach 


cae tae ae ae Re eo 
gg" OR as “Saag 8 Be gghe 9. Cigupronsintmtly gyggiar 
es) Poe "aise" ‘Sa Omrygggee cov rapgge ise Cores gigg 

18 cc a ee ee ee ees 


tte etation, @xigh Aw & tm of the velocity of apraecch to the 
fem, thaveanns EMM Ciseehy wPul es dente tear he eee fe tm 
a BEAR ENT, ras oe Nc Ape KS 3 Bape peer 


i we ok eee Tite, the MAELO OF inereon within thy waa 
sf mpconrecints 0 Dijenee “ve iniieatiiesn ove, therefore, tat 


Depth eras Gee dma ns occurred ter wry cio Deheee 
a 0 ET EES = AE eel 
Pe egy eaeggy He Me tw vatar ong te em, ag 
te SN OM Oh por rer tee tegperbe the qagge 
OE ER ERS tg Ome Hageman mogayy 
BE Rae MORE ype eoggy® Semen iggprertny the gay 
balk Of the weteor powsie over the Gav ae Set Bias, May ° hee 
Beis ja dewoaater ded Np uhe Duhlemiy Gi ehdh bee tenet 
siardthitn wheat tendaghiitadinaieaaimara titania. 
‘range of these determinations exe consistently higher (from 12.3), to 1746/5) 
than those obtained from the Leconte curve. 
HATES hes cr tree itinmeniiedsitte dentists tran inal 


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Dole ariel epee are 
ae 18 to be noted thet tho svemen stron veisetty at the 
aging station, which ip a seasure of the velocity of approngh to the 
Gam, tnereases almost directly with the th over the arest of the dam, 
ye, is som graphically in diagram Hy the weloaities ali ta: a 
tony on the sane. straight Line, the ratio of increase within the range 
for such grost davthe gyur the dan a0 coaureyd tn the great flood of terdh, 
Smnaattitt ccs... 
than the velocity indueed by the M11 of the water over the, —_ 


The greatest depth of flow orer the eee... ts oie 
Gepths flow over Sunol dam they occur at infrequent intervals, the great 
bulk of the water passing over the dam at depths not in extess of 3 foot. 
_ = Ghds 1a demonstrated by the following table which hat been 


the Cam Gaeiy flag whew magne: cat bet 2 fee, Be gud coated 


Veornaigem air oncyielest fe takers thot the pye~aS at «toch Seek be 
wataniadtyignectur Sa gfe cca 4 of the Apvdrek Ria bas Sopa se 


Ferri 4 


woah att 20 qe 


a Ng a lg 7 
2 5 Ns “ 
“ih 


{ : 
sen st ar thie ina Paling Cann 
| BE conve coment eee. ks herctotors WM, tin noone. FM supecure~ 
PB sows tow BME ant 0 ark ieee ee iP Bon sue 
IMs: 0p AME toro te, snare te, 11 20 ap PMMBeion agen 
ee ee a | nn 


BP sp 2t00 rire AP any, Au oF 
910 mem © cnet angel 
191 40,068 46,712 67,580 
asiz neni, iininntil ih... 


Thie table hows that for the 12 years shout 64% of the 
total flow over Sunol dam cecurred with depths of 3 feet or less. In 
5 out of the 12 years, the entire flow over the dam was with depths not 
in extess of 3 foot, ani even im the years of 1907 and 1911 With abuomml 
run-off the flow with depth of 3 fect ar less was nearly 50% of the totale 
This amilysis shows that, although the groatest depth over 
the dam during the stream gagings was but 2 feet, the results obtained 
therefrom are sufficient to indicate that the run-off of Alameda Creek is 
materially greater than given on page 4 of the Spring Valley Water Comany's 


semquiceys Li 


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Dwort ca ae ice ater apy af dan eonuee freee Gonmration 
and Use of Ste Present Regowmags” 0. the. Memowmhe segretary of the De- 
terior ani the Advisory Bond of Inginoers of the United States Amy. In 


‘PN ag eae thar cl en en 


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Seaplane tris Jom. 1a 1S, babs 8 Pik, ike 1% De, by Pe ee ee “5 gs 
: Gaging made Jane RB g AOS, AS Peleg Wy FC sHemrmem ani P.?.Jones, 


Bo. 6058, 


451.6 aq. Ste Mom Velocity 1.30. Discharge 562-8. 
‘ ete 


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cage hotght st Hg: Velnittng 1.68, eit. 1665, ube 1.6. ete mo.’ 68. 


ESAS AS 


& 


ERGE EGGS E 
BUUEEEEESS 


10° 55° soe! oly jditten metot a 

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oS 1) ae” 489 «= Sin correct tie 

het SiG Minh 4 Pe Me. a Aas 


Sempates Ry ft & Sapte 


Computed by 7. ¥. Eepy. 


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Gaging mde Jan. 18, 1915, dogs 2:55 Pulls ond. 3130 7.H., by 7.C,Hermam onl P Peony 


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an Alameda Oresk at Sunol Dam. 
Gage height in fb. beginning 2.67, only 2460, oan 2.65. Motor To, 6158... 


Total aren S521 aq. ft. Ment velocity 2.75, Disolnrge M69. 


et 
116.5 


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o7L «AZ eR? 10 6.0 60. 196.2 Int. 61 tov. 40h 


o72 «= ieth «=o BSL 10 «GIS BL 1704 


10 


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275 «1450 SAB 10 468 (42. (144.9 - Int. 49 rev, Stl oom 


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64 14628 2.96 20 4.0 40, 228.0 


Se 100 2.60 


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Compated by T. W. Bapy. 


YAGAAM MOL 


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an 


men enteeitaengglipsaiany meme sessions inter treaty tin eet an ti ayers 


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Lilev. oF 200 of Gages = 20/ BF 
Gage V£2/, Ces 


Gage N22. 


a 


Slev. 2O/ 23 


Cree: 


iN 
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foot Briggce 


SLE Noy J | R&itomare 
. So Gage 4eCorcée COO/ 
Auto fnath a: G9 Station 


ars 
Gage Hecorder 


Alameda Creek a? Suriol Daiz. 


towing Locator 
oF 


Gaging 5: 4atior. 
Scale: /"=100! 


me 
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as iall Me ic ree 
:: giana 


ag 
4. 
2. 
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SW 
4 


40 


= a ess sb 
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So 


Lout 200 feet 


CLYRVE 


A ~me0sti(-eA As 4a mean 


a 
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SR eles 
v9 5.8 
(0d SR 
es 


DIAGRAM N23. 


OO Ag 
= Ce ee 


Ce 


Ss 


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wy 
re) 
co 
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= 


a 


Ligy poh deds—' 


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=) 


yracuse, N. Y. 
PAT. JAN 21, 1908 


